Understanding JavaScript Promises: A Coding Explanation

You know how JavaScript performs one function at a time and it becomes time consuming when a function takes too long to complete? This is because Js is a single threaded language and this behavior is called as synchronous. It can perform one task at a time which blocks other code. This can be solved by using Asynchronous functions (non-blocking way). JavaScript can execute code in two different ways: Synchronous (Blocking) Code runs line by line Each task waits for the previous one to finish If one task is slow, everything else pauses Think of it as a single-lane road. Asynchronous (Non-blocking) Time-consuming tasks run in the background JavaScript continues executing other code Once the task is done, the result is handled. In the next post I will tell how asnyc functions work. See you later. Cheers!! #JavaScript #WebDevelopment #MERN #AsyncJS #LearningInPublic

“JavaScript is easy.” Until this happens… 🤐 console.log(1 + "11") 👉 111 😵 Wait… what? Here’s what’s happening 👇 In JavaScript, the `+` operator does TWO jobs: ➕ Math addition ➕ String concatenation If one operand is a string, JavaScript silently converts the other one into a string too. So: 1 + "11" becomes "1" + "11" = "111" This is called **Type Coercion** (implicit conversion). 🔄 And that’s just the beginning… JavaScript also has something called - Truthy & Falsy values 👇 Falsy values (remember: FUNN0""): ❌ false ❌ undefined ❌ null ❌ NaN ❌ 0 ❌ "" (empty string) Everything else? ✅ Truthy. That’s why: if ("0") { console.log("Runs") } 👉 It runs 😅 Because "0" is a string — and it's truthy. JavaScript isn’t hard. But it’s full of silent behavior that can trick you. Have you ever been stuck because of type coercion? 👇 Comment your weirdest JS bug. #JavaScript #WebDev #Frontend #CodingTips #JSLearning

Day 5 of my JavaScript journey Today I went behind the scenes of JavaScript to understand how it works, and here is what I found; When you write JavaScript, it feels simple. You declare variables. You call functions. You await promises. The browser responds. Things move on the screen. But under the surface, there’s an entire engine working relentlessly to make that happen. JavaScript is a high-level language. This simply means you don't have to worry about managing your computer's memory or CPU manually. JavaScript quietly handles all of that for you in the background. That's one less thing to stress about as a beginner. It is also multi-paradigm. A paradigm is just a mindset or approach to writing code. And JavaScript doesn't force you into one way of thinking, you can structure your code in multiple ways depending on what the situation calls for. That flexibility is honestly one of the biggest reasons JavaScript is so popular. And then there's the concurrency model, how JavaScript handles multiple tasks at the same time even though it can only do one thing at a time. This is because, the "Event Loop" constantly checks: is the call stack empty? if yes, move the next task from the queue to the stack #JavaScriptJourney #LearningToCode

There’s some very useful capabilities coming to JavaScript: “[Symbol.dispose]()” and “using”. Mat Marquis is here to explain why they’re coming and how to use them effectively.

Hoisting isn’t magic — it’s how JavaScript prepares your code before execution. JavaScript hoists declarations, not initializations. With var, the variable is hoisted and initialized as undefined. That’s why you don’t get an error — just an unexpected value. With let, the variable is hoisted too, but it stays in the Temporal Dead Zone until it’s actually defined. Access it early, and you get a ReferenceError. Same concept. Very different safety. This is why modern JavaScript prefers let — it makes mistakes obvious instead of silent. #JavaScript   #FrontendDevelopment   #WebDevelopment   #LearnToCode

Most beginners don’t hate JavaScript… They hate callbacks 😐 Because once your app grows, your code starts looking like this 👇 Nested callbacks. Unreadable logic. Debugging nightmare. This problem even has a name 👉 Callback Hell 🔥 That’s exactly why JavaScript introduced PROMISES. Promises didn’t change async behavior. They changed how humans read async code. ✔️ No deep nesting ✔️ Clear execution flow ✔️ One place for error handling I explained this step-by-step with visuals and real code examples in 👉 JavaScript Confusion Series – Part 2 🔗 Read here: https://lnkd.in/gdxzCMEB If callbacks ever made you think “I understand JS… but something still feels off” 👉 this will finally make it CLICK 💡 💬 Comment “NEXT” if you want Part 3: Why async/await feels like magic 🔥 #JavaScript #WebDevelopment #FrontendDevelopment #LearnJavaScript #JavaScriptConfusionSeries #Programming #CodeNewbie

“Ever tried using a variable before declaring it… and got weird results?” That’s JavaScript hoisting playing tricks! > In JavaScript, declarations are lifted to the top of their scope before the code runs. > But not everything behaves the same: • Functions: fully hoisted — call them anytime. • var variables: hoisted, but start as undefined. • let & const: hoisted too, but trapped in a “temporal dead zone” — using them too early throws an error. > Knowing hoisting helps prevent tricky bugs. Declare first, use later, and stay ahead of surprises! #JavaScript #WebDev #CodingTips #ReactJS #LearnByDoing

Understanding the Node.js event loop finally made async JavaScript click for me. Here’s a simple example that confused me earlier: console.log("Start"); setTimeout(() => console.log("Timeout"), 0); Promise.resolve().then(() => console.log("Promise")); console.log("End"); Many beginners expect: Start → Timeout → Promise → End But the actual output is: Start → End → Promise → Timeout Why? Because Promises (microtasks) run before timer callbacks in the event loop. That one concept explains a lot of async behavior in Node.js. Once I understood this, debugging async issues became much easier. What JavaScript concept took you the longest to understand? #nodejs #javascript #backend #webdevelopment #softwareengineering

Just caught a classic JavaScript mistake that had me scratching my head for a second! 🤦🏾♂️ I was setting up form validation with `blur` event listeners, and my validation functions were running immediately on page load instead of waiting for the user to leave the field. The culprit? I forgot to remove the parentheses when passing functions to event listeners When you include the parentheses `()`, JavaScript calls the function immediately and passes its return value to the event listener (which is usually `undefined`). Without the parentheses, you're passing a reference to the function itself, which gets called later when the event fires. It's a subtle difference, but it completely changes the behavior. The function reference waits for the event; the function call happens right away. A quick fix this time,thankfully. Easily done. #JavaScript #WebDevelopment #LearningInPublic

Big news for JavaScript developers: the Explicit Resource Management proposal is making it much easier to clean up resources in your code. At its core, this effort introduces a standardized cleanup pattern and a new using keyword that lets you tie disposal logic directly to a variable’s scope; meaning things like sockets, streams, and generators can be reliably cleaned up when they’re no longer needed. This brings greater predictability to resource management and reduces the risk of leaks or dangling connections. The proposal has already reached Stage 3 of the standards process and is implemented in most major browsers (except Safari), giving you a chance to experiment with it now. Key takeaways for dev teams: 🔹 Common cleanup methods like .close(), .abort(), etc., get a consistent pattern via [Symbol.dispose] 🔹 The using declaration ensures automatic cleanup at the end of a scope 🔹 Helps write safer, more maintainable code with fewer manual resource errors If you care about robustness and clarity in your JavaScript projects, this change is worth exploring. #JavaScript #WebDevelopment #CleanCode #ECMAScript #Programming #SoftwareEngineering